embassy/embassy-stm32/src/i2c/mod.rs

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#![macro_use]
#[cfg_attr(i2c_v1, path = "v1.rs")]
#[cfg_attr(i2c_v2, path = "v2.rs")]
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mod _version;
use crate::peripherals;
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pub use _version::*;
pub enum Error {
Bus,
Arbitration,
Nack,
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Timeout,
Crc,
Overrun,
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}
pub(crate) mod sealed {
use crate::gpio::Pin;
pub trait Instance {
fn regs() -> &'static crate::pac::i2c::I2c;
}
pub trait SclPin<T: Instance>: Pin {
fn af_num(&self) -> u8;
}
pub trait SdaPin<T: Instance>: Pin {
fn af_num(&self) -> u8;
}
}
pub trait Instance: sealed::Instance + 'static {}
pub trait SclPin<T: Instance>: sealed::SclPin<T> + 'static {}
pub trait SdaPin<T: Instance>: sealed::SdaPin<T> + 'static {}
crate::pac::peripherals!(
(i2c, $inst:ident) => {
impl sealed::Instance for peripherals::$inst {
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fn regs() -> &'static crate::pac::i2c::I2c {
&crate::pac::$inst
}
}
impl Instance for peripherals::$inst {}
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};
);
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macro_rules! impl_pin {
($inst:ident, $pin:ident, $signal:ident, $af:expr) => {
impl $signal<peripherals::$inst> for peripherals::$pin {}
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impl sealed::$signal<peripherals::$inst> for peripherals::$pin {
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fn af_num(&self) -> u8 {
$af
}
}
};
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}
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crate::pac::peripheral_pins!(
($inst:ident, i2c, I2C, $pin:ident, SDA, $af:expr) => {
impl_pin!($inst, $pin, SdaPin, $af);
};
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($inst:ident, i2c, I2C, $pin:ident, SCL, $af:expr) => {
impl_pin!($inst, $pin, SclPin, $af);
};
);